footer{
    position: fixed;
    bottom: 0;
    width: 100%;
    height: 12vh;
    border-top: 1px solid #e0e0e0;
    background-color:#fff; 
}
footer ul{
    margin: 0;
    padding: 0;
}
footer ul li {
    text-align: center;
    list-style: none;
    width: 25%;
    height: 12vh;
    float: left;
    font-size: 1.5rem;
    margin-top: 1.5vh;
}
footer ul li img{
    height:5vh;
    width: 5vh;
}
footer ul li a{
    color: #999999;
}
footer ul li a:hover{
    color:#f56a00;
}
footer ul li a:hover{
    text-decoration: none;
     
}